Calculation of Temperature Changes in Mass Concrete of Hydro Power Plant (CROSBI ID 528013)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mikulić, Dunja ; Gabrijel, Ivan ; Uzelac, Srđan
engleski
Calculation of Temperature Changes in Mass Concrete of Hydro Power Plant
Following the needs of the hydro power plant (HPP) Lesce construction on the river Dobra in Croatia, the development of maximum temperatures in mass concrete blocks of the power-plant’ s gravity dam is analysed. Hardening of early age concrete is connected to chemical processes which go along with a severe temperature and dimensional changes depending on the quantity of cement, heat of hydration, initial temperature of concrete and temperature changes of the environment. When constructing mass concrete elements two conditions are set connected to temperature changes in concrete. One is the maximum temperature that concrete is allowed to achieve because of hydration process. The other condition is much more complex and it refers to the temperature gradient which is forming from the inside out to the surface and it is a consequence of the heat transfer from concrete block to the environment and of the small thermal conductivity of concrete. The problem is mathematically solved using two different methods for the heat transfer problems. First method is Schmidt’ s numerical method. With this method we solved one dimensional transient heat conduction. Second method of solving was a finite element method with the software package Cosmos/m. Problem was with this method solved on the two dimensional model which is subjected to a simetrical load so that results from both methods can be compared. With this method transient analysis was performed taking into account heat transfer through conduction and convection. Computer calculations of different extreme initial conditions and environmental conditions enable detailed analysis of different parameters of construction technology such as: height of blocks, quantity and type of cement, time-table of concreting and so on.
mass concrete; temperature changes; heat transfer analysis
fib = Federation internationale du beton
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
227-234.
2007.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of the fib Symposium Dubrovnik 2007 Concreta Structures - Stimulators of development
Radić, Jure
Zagreb: Structural Engineering Conferences (SECON)
978-953-95428-3-0
Podaci o skupu
Concreta Structures - Stimulators of development
predavanje
20.05.2007-23.05.2007
Dubrovnik, Hrvatska